Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o episódio na NHK com média de audiência de 9.2%?
 ###Tabelas: CREATE TABLE preliminary_competition (preliminary_competition_id AUTO_INCREMENT PRIMARY KEY, State VARCHAR, Interview INT, Swimsuit INT, Evening gown INT, Average INT) CREATE TABLE monthly_mobile_subscriber_additions (monthly_mobile_subscriber_additions_id AUTO_INCREMENT PRIMARY KEY, Year INT, January INT, February INT, March INT, April INT, June INT, July INT, August INT, September INT, October INT, November INT, December INT, Annual Additions(in millions) INT, Average Monthly Additions(in millions) INT) CREATE TABLE former_professional_football_teams (former_professional_football_teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Sport VARCHAR, Played VARCHAR, Venue VARCHAR, Championships VARCHAR) CREATE TABLE doubles_titles_5 (doubles_titles_5_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score VARCHAR) CREATE TABLE 2008_spring_season (2008_spring_season_id AUTO_INCREMENT PRIMARY KEY, Japanese Title VARCHAR, Romaji Title VARCHAR, TV Station VARCHAR, Episodes INT, Average Ratings VARCHAR)  
SELECT COUNT Episodes FROM 2008_spring_season WHERE TV Station = nhk AND Average Ratings = 9.2%